A flaw was found in ruby gem-rack. This flaw allows a malicious actor to craft requests that can cause shell escape sequences to be written to the terminal via rack's Lint middleware and CommonLogger middleware. This issue can leverage these escape sequences to execute commands in the victim's terminal.

A denial of service flaw was found in ruby-rack. An attacker crafting multipart POST requests can cause Rack's multipart parser to take much longer than expected, leading to a denial of service.